Malicious PDF — malware analysis report

Static analysis result for SHA-256 375a63f741351dbe…

MALICIOUS

PDF

91.5 KB Created: 2021-09-04 04:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 30c406d4ef556c81088e7f110ffe1486 SHA-1: 42f90739465a1004bc12539fcd7540b1ee2a65a2 SHA-256: 375a63f741351dbe2491c952e2cbbf9562871b5d6612f2e2fb4c375e0fe968a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging the 'giving directions' lure in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=giving+directions+esl+worksheet+map PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cm668j5tavn5fjmuvoa9ro2i70/24434091724.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/xonudukoveb.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/didaxu.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/vidikuteledolidafubide.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/62192439485.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/p83npk3pn21gl3cprvdcpc5cnq/lovitujuw.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5937e74269f533f7a5d357084271b400/84540056731.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/jidazux.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/minog.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210818065036.pdfIn PDF document text
    • https://temahr.hr/files/nevuxe.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/52127829686.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160832e6cae811---79688634299.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/24518945524.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160730e33269ce---98956241031.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/kaximafovi.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acb025b1e3f---doxuxisanobalijo.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/55019672098.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c055c455e6961b86f42c3a13f1fc3726/70429283945.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/8m2na6iodtm474gfjml6m07tl3/80197974792.pdfIn PDF document text
    • http://epsilonsigorta.com/files/sazalivadug.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/raxurotesugapelozexaz.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a43644b49a0---tipotajupuzufafe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 17124 bytes
SHA-256: b2cab35c314ded2a54b2d95ffed5a50c01d17e1a2b81fcd261c13bde36196090
font_02_sfnt_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 11244 bytes
SHA-256: 68ccb0886e6f82c3369589ff83a93a1afccaecdf5876f08ed82a6e4f8a88d9ca
font_03_sfnt_off0001330a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330A 17404 bytes
SHA-256: 6f9fb26e15fd63e2b46c9bdafeed16197cff40897a91dae936712aa4b3b198e0

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